承德柳九星叶甲的生物学特性研究

Study on Biological Characteristics of Chrysomela Salicioorax Fairm in Chengteh

对承德柳九星叶甲的生物学特性进行了研究。结果表明,柳九星叶甲在河北承德1年发生2代,以成虫在枯枝落叶层内、土缝或树皮缝内越冬,翌年4月下旬至5月上旬上树为害,至6月下旬出现第一代成虫,7月下旬至8月上旬出现第2代成虫,并在树上为害到10月下旬下树越冬;每年7月上中旬为该虫为害盛期。

Biological characteristics of Chrysomela Salicioorax Fairm in Chengteh were studied. Result showed that Chrysomela Salicioorax Fairm had two generations in a year in Chengteh. It survived through winter in forest litter, soil seams and bark seams. Next year it climbed up and harmed the trees from late April to early May. The first generation appeared at late June. The second generation appeared from late June to early August, and harmed trees till late October, then with overwintering under the trees. The most harmful period of this insect was early and middle July in each year.